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\title{Branching Random Walks on Graphs}


\author{Chinmoy Dutta \thanks{College of Computer and Information
    Science, Northeastern University, Boston MA 02115, USA.  E-mail:
    {\tt \{chinmoy, rraj,str\}@ccs.neu.edu}.  Supported in part by NSF
    grant CNS-0915985.}  \and Gopal Pandurangan \thanks{Division of
    Mathematical Sciences, Nanyang Technological University, Singapore
    637371 and Department of Computer Science, Brown University,
    Providence, RI 02912, USA.  \hbox{E-mail}:~{\tt
      gopalpandurangan@gmail.com}. Supported in part by the following
    grants: Nanyang Technological University grant M58110000,
    Singapore Ministry of Education (MOE) Academic Research Fund
    (AcRF) Tier 2 grant MOE2010-T2-2-082, US NSF grant CCF-1023166,
    and a grant from the US-Israel Binational Science Foundation
    (BSF).}  \and Rajmohan Rajaraman~$^*$ \and Scott Roche~$^*$}

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{\bf Keywords:} Random Walks, Branching Process, Expanders,
Information Spreading, Gossip, Coverage Time.

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{\bf Regular Presentation}
  
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